build(deps): bump third_party/yosys from `91fbd58` to `078b876` (#2335)

Bumps [third_party/yosys](https://github.com/YosysHQ/yosys) from `91fbd58` to `078b876`.
- [Release notes](https://github.com/YosysHQ/yosys/releases)
- [Commits](https://github.com/YosysHQ/yosys/compare/91fbd58980e87ad5dc0a5d37c049ffaf5ab243dd...078b876f505647c992479c2afcf50f0850ea6fac)

---
updated-dependencies:
- dependency-name: third_party/yosys
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

third_party/yosys

diff --git a/third_party/yosys b/third_party/yosys
index 91fbd58..078b876 160000
--- a/third_party/yosys
+++ b/third_party/yosys
@@ -1 +1 @@
-Subproject commit 91fbd58980e87ad5dc0a5d37c049ffaf5ab243dd
+Subproject commit 078b876f505647c992479c2afcf50f0850ea6fac